Re: [Emc-users] 5I20 Stepper motors and encoders
On 19 February 2010 07:12, Belli Button be...@iafrica.com wrote: Here's a question for those in the know. I have a 5I20 that I intend to use for driving step/dir signals for my stepper motors. I would like to add encoders to the steppers so that I can measure if I have lost any steps at some point. Question is, do I need the 7I33 for encoder inputs? Not necessarily. You can connect the encoder signals directly to the 5i20 as long as they are the correct (logic level) voltages. You probably need some sort of signal conditioning though. Even my home-made encoders which were designed for easy interfacing to the 7i43 have pull-up resistors on the breakout board so that the actual encoder signals are a current loop rather than a voltage while travelling around the machine. (Calling it a breakout board is a bit pretentious, it is a rectangle of stripboard with headers soldered to it) How can I get axis to display the desired positon and the encoder position? I don't know. But does it actually gain you much? If the numbers are different you need to stop -- atp -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] THC - torch height control
Dave wrote: Do you think you will have any issues with the ultrasonic sensor and the water mist from the waterjet? I was to work on a waterjet system next week but the project has been delayed. That machine has a constant mist/cloud of water vapor around it. Yeah, I was wondering about that. When piercing the initial hole in stock, the jet can bounce back with immense force, and it is loaded with Garnet dust. Unless there is a shield that can be flipped in place during piercing, I would suspect the sensor would have to be tremendously robust or it will have a very short life. Jon I do not see that vapor is problem - there was some freaky height sensor previously installed near the nozzle - all the plugs and connections of wires have to be sealed and that's basically all. splashes, especially during piercing, are far more bigger concern, that's where i agree. splashes are the thing, where i have not found a solution yet. i have an idea that i could make a shield from a material that is transparent for that particular wavelength of ultrasound, but i will have to check that in more detail, if that is possible. changing the shield with few cm in diameter from time to time, if it gets damaged, does not seem like a big cost issue. another idea is to put the sensor in a shell, which closes during piercing - that would involve some additional commands in G-code - i mean M100 - M199 user-definable commands, where that particular command would activate a magnet for few seconds through some relay and magnet would close a cover of the shell of the sensor. anyway, the working principle for THC for plasma, and for waterjet and also laser as well is the same, as both of these technologies are cutting material with some kind of beam and it is supposed to hold the torch/nozzle in some specific height few mm above the surface of material thank You, guys for Your suggestions on PLC and Classic Ladder. You have helped me a lot, because now i have a direction, where to look for a solution, i really appreciate that! Viesturs -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 5I20 Stepper motors and encoders
Andy Pugh wrote: On 19 February 2010 07:12, Belli Button be...@iafrica.com wrote: How can I get axis to display the desired positon and the encoder position? I don't know. But does it actually gain you much? If the numbers are different you need to stop You can use a pyvcp panel in axis to display the encoder position. http://www.linuxcnc.org/docs/2.2/html/hal_pyvcp.html -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 5I20 Stepper motors and encoders
On Fri, 19 Feb 2010, Belli Button wrote: Date: Fri, 19 Feb 2010 09:12:55 +0200 From: Belli Button be...@iafrica.com Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Subject: Re: [Emc-users] 5I20 Stepper motors and encoders Hello, Here's a question for those in the know. I have a 5I20 that I intend to use for driving step/dir signals for my stepper motors. I would like to add encoders to the steppers so that I can measure if I have lost any steps at some point. Question is, do I need the 7I33 for encoder inputs? How can I get axis to display the desired positon and the encoder position? Thanks, Greg You dont need a 7I33 for just encoder inputs, TTL or single-ended type encoders can connect directly to the 5I20. If you have differential output encoders, you may want a 7I47 as a differential-single-ended converter (which has the side benefit of buffering the step-direction outputs) -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your ()_() signature to help him gain world domination. -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 7i43 GPIO Input Question
Flying Electron wrote: Hi, I was using one of the inputs to read my E-STOP button which shorts to ground when triggered, but I kept on getting false positives. I looked at the input pin in halscope and saw a square wave that goes high for 2ms then low for 2ms and repeats. I removed the E-Stop button and everything else connected to the IO of the 7i43 so it is just the parallel port and the usb cable powering the 7i43 connected. Looked in halscope again, and the square wave is still there with nothing connected. Checked several other unassigned pins and they also show the square wave. Anyone have any ideas on what is happening? Thanks! Lawrence I figured out that if I don't load the arduino in the HAL then the square wave goes away and the pin stays high like it should. I commented out loadusr -W arduino /dev/ttyS0 3 from my HAL file and everything seems to be ok. I don't understand why the arduino and the hostmot2 would cause problems with each other though. One is a serial port and the other is a parallel port. -- Download Intel#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
